Comment 3 for bug 1971002

Hello,
I experience the same trouble for synaptic, but not only, since i've installed mate on an old laptop (did not test yet on recent release).
As soon I try to use the search on synaptic, on cliking on an icon to launch a gui app (ie an .doc file), on webrowser (falkon, firefox,.. using right-click on a link, opening gmail.com, keytradebank.be,....), launching notepad++, changing screen display,...
--> will exit / disconnect session (black screen for 20 sec. then send to the welcome session screen...

I added gnome-session and gnome-shell-extension... if I start with gnome classique (wayland or X11) everything works ok...

I run the script if this could help...